jon: congressman michael mccaul who is on the homeland security committee, in fact he chairs that committee was on "fox news sunday" over the weekend saying that it doesn't look to him like these two guys acted alone, that they had some training or some help. how much help are the russians being in helping us look into this? do you know? >> reporter: to hear the chairman of the intelligence committee, mike rogers talk about it, not much. in fact they have not been helpful at all, to hear him skreut. i describe it. the russians need to step up to the plate here and provide better information, in his words. there are some reports about the russians and what they may have in this. u.s. officials are now trying to get to the bottom of what the russians had on both tamerlan and the mother. the question is about how many other people may be involved. the mother is obviously a person that they would want to question. investigators would want to question. you talk to terrorism experts. counterterrorism experts and catherine herridge has done great reporting about the detonators usedhese bombs, this